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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Gramado, Brazil (2019.9.15-2019.9.18)] 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Method to trace the photovoltaic characteristic curves under partial shading conditions
摘要： The I-V curve is an important parameter, because it has the characteristics of PV panel. It shows compactly that happens in the module due external variations. In this article presents a method to trace the photovoltaic curves under partial shading conditions. Also, it mentions the effects of the bypass diode. Lastly, it makes comparisons between curves of shaded panels and panels with regular irradiance.
关键词： Photovoltaic systems,Lambert function,Newton-Raphson,PV partial shading
更新于2025-09-16 10:30:52
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Performance enhancement of Hybrid interconnected Solar Photovoltaic array using shade dispersion Magic Square Puzzle Pattern technique under partial shading conditions
摘要： During Partial Shading (PS) condition, Solar Photovoltaic (SPV) array exhibits multiple peaks in both Power-voltage and Current-voltage characteristics, leading to Mismatch Power Losses (MPL). Overcoming the losses, enhancing power and performance improvement of SPV array during PS conditions is a challenging task. MPL due to PS condition, not only depend on the shaded area, but also on SPV array Interconnections and Shading Patterns. The present investigation aims to enhance the output power of SPV array subjected to PS conditions. Studies are initially performed on eight combinations of SPV array test panel interconnections. Results obtained imply improved performance of the ‘Proposed New Reconfigured Hybrid interconnected array’ under four defined different typical partial shading conditions. Also, performance of ‘Proposed New Hybrid interconnected array’ with ‘Shade Dispersion Magic Square Puzzle Pattern’ technique applied is shown to be superior, compared with either SUDUKO or ODD-EVEN shade dispersion technique.
关键词： Shade Dispersion Magic Square Puzzle Pattern (SDMSPP),Solar Photovoltaic (SPV),Hybrid Interconnections,Partial Shading (PS),Power Enhancement
更新于2025-09-16 10:30:52
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Analysis and experimental validation of partial shading mitigation in photovoltaic system using integrated dc–dc converter with maximum power point tracker
摘要： An integrated dc–dc converter with maximum power point tracker (IDCCM) is an electronic device that can be utilised to increase the output power of a photovoltaic generation system. Despite its potential benefits, there is an absence of a comprehensive analytical work to characterise the IDCCM performance under different partial shading conditions. Thus, this work proposes an analytical method to evaluate the system with IDCCM for different shading pattern/intensity, irradiance, and temperature. To validate the analysis, the SPV 1020 boost-type IDCCM devices are incorporated into a 2?kWp experimental test-rig. The performance of the IDCCM is benchmarked against the conventional system that utilises bypass diodes (alone). The results indicate that the IDCCM improves the performance of the central inverter as it ensures the latter consistently tracks the global peak. Also, it was found that that the performance of the IDCCM depends on the shading intensity: at low intensity, the IDCCM is able to extract energy from the shaded modules; however, it is ineffective at high shading intensity. Furthermore, when the shading is absent, the energy gained by the IDCCM is offset by the continuous power losses due to its internal operations.
关键词： maximum power point tracker,partial shading,dc–dc converter,photovoltaic,IDCCM
更新于2025-09-16 10:30:52
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Power rating analysis and protection for photovoltaic-isolated port based differential power processing systems
摘要： In a photovoltaic generation system (PGS), photovoltaic (PV) modules are often connected in series for increased string voltage. However, a significant reduction in the actual output power is observed due to the manufacturing tolerance, module aging and partial shaded. Compared with conventional methods such as bypass diodes and PV module reconfiguration, modular distributed architecture especially the differential power processing (DPP) is able to yield high output power even under partial shading conditions. Moreover, the system efficiency is improved since only the differential power is processed by the DPP converters. This paper mainly focuses on the power rating analysis and protection of PV-isolated Port (PV-IP) based DPP systems considering the significant power stress difference among DPP converters under different partial shading conditions. The voltage equalization (VE) control used in this work is able to provide up to 77% efficiency improvement through the simulation evaluation. The protection algorithm is proposed for the PV-IP DPP architecture to improve the system reliability even when some DPP converters are found failed. With the proposed protection strategy, not only the high output power yield can be maintained, but also the modular design of DPP converters with smaller power capacity can be achieved. Simulation and indoor experimental tests under various partial shading conditions were carried out to validate the effectiveness of the proposed power rating analysis and protection scheme.
关键词： Partial shading,Differential power processing (DPP),Power rating,PV submodule integrated converter (subMIC),Optimization,PV-Isolated Port (PV-IP) DPP
更新于2025-09-16 10:30:52
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Fractional Chaos Maps with Flower Pollination Algorithm for Partial Shading Mitigation of Photovoltaic Systems
摘要： Solar Photovoltaic (PV) systems have become prominent and have attained the attention of energy engineers, governments and researchers. To achieve the maximum bene?t from the PV system in spite of its nonlinear characteristic and environmental conditions, ?nding a robust maximum power point tracking method is essential. Over two decades, various researchers proposed numerous MPPT methods, but they failed to evaluate their methods on consistency, reliability, and robustness over several numbers of runs. Most of the researchers examined one con?guration and they did not to consider the dynamic change in the irradiation conditions. Therefore, in this manuscript, the authors introduced a novel optimization technique Fractional chaotic Flower Pollination Algorithm (FC-FPA), by merging fractional chaos maps with ?ower pollination algorithm (FPA). The proposed technique, help FPA in extracting the Global Maximum Power Point (GMPP) under different partial shading patterns including with different PV array con?gurations. The proposed FC-FPA technique is tested and evaluated over 5 different patterns of partial shading conditions. The ?rst three patterns are tested over 4S con?guration made with Shell S36 PV module. The other two patterns are applied to the 4S2P con?guration of Shell SM55 PV panels. The performance of the proposed variant is investigated by tracking the GMPP for abruptly changing shade pattern. Exclusive statistical analysis is performed over several numbers of runs. Comparison with perturb and observe MPPT technique is established. These results con?rm that, the proposed method shows fast convergence, zero oscillation and rapid response for the dynamic change in irradiation with consistent behavior.
关键词： maximum power point tracker,?ower pollination algorithm,fractional chaos maps,partial shading conditions
更新于2025-09-16 10:30:52
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Impact of Bypass Diode Forward Voltage on Maximum Power of a Photovoltaic System under Partial Shading Conditions
摘要： The maximum power of a photovoltaic system can reduce significantly under partial shading conditions. Bypass diodes can be used in photovoltaic systems to bypass the shaded photovoltaic modules during partial shading. The bypass diode possesses a forward voltage that introduces a voltage drop in the photovoltaic system upon activation. Therefore, the maximum power of a photovoltaic system can reduce further during partial shading due to the forward voltage of the bypass diode. This paper presents an investigation into the effect of bypass diode forward voltage on the maximum power of a photovoltaic system under partial shading conditions. The results indicated that the forward voltage of the bypass diode did not necessarily decrease the maximum power of the photovoltaic system. This depends on whether the maximum power is delivered at a lower or higher voltage. When the maximum power is delivered at a higher voltage, it is insusceptible to the forward voltage. Conversely, when the maximum power is delivered at a lower voltage, it is susceptible to the forward voltage. In the worst-case scenario, the forward voltage of the bypass diode reduced the maximum power of the photovoltaic system by 16.48%, which was already subject to partial shading loss.
关键词： P-V characteristics,solar energy,Photovoltaic,bypass diode,partial shading
更新于2025-09-12 10:27:22
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[IEEE 2019 International Conference on Power Generation Systems and Renewable Energy Technologies (PGSRET) - Istanbul, Turkey (2019.8.26-2019.8.27)] 2019 International Conference on Power Generation Systems and Renewable Energy Technologies (PGSRET) - Modeling Photovoltaic String in PLECS Under Partial Shading
摘要： The industry of solar energy and its application areas have developed and received much attention over the last two decades. Therefore, the types of photovoltaic (PV) system simulations are investigated and mostly discussed models close to the physical behaviour of a PV panel or system. Under the real conditions such as cloud coverage, the shadows of nearby objects, dusty air, and dirty surface area, etc. result in partial shading issue, which is the core problem of predicting how the system behaves electrically. This paper describes the electrical behaviour model of an established PV string consisting of an experimental curve of CHN250-60P panel shown in the datasheet. The simulation model is performed through the instrumentality of Piecewise Linear Electrical Simulation (PLECS) Block-set in MATLAB/Simulink platform. With the proposed model, the I-V and P-V curves of the system can be represented according to the values of a 3D Lookup Table (LUT). Consequently, the simulation results are dealt with partial shading issue to verify a correct model in different solar irradiance and temperature.
关键词： modeling,Photovoltaic systems,PLECS?,MATLAB,partial shading
更新于2025-09-12 10:27:22
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A capacitor based fast I-V characteristics tester for photovoltaic arrays
摘要： In order to efficiently evaluate the operating status of photovoltaic (PV) arrays, a design of fast current-voltage (I-V) characteristic tester is proposed in this paper. The tester uses the dynamic capacitor charging method to quickly sweep I-V characteristic curves. Then, a new artificial bee colony and Nelder-Mead simplex (ABC-NMS) hybrid algorithm is used to extract parameters of the single diode model of PV arrays. The experimental results show that the tester can quickly measure high-quality I-V curves of PV array and achieve accurate model parameters extraction. In addition, the root mean square error (RMSE) of curve fitting can be used to effectively indicate the partial shading condition.
关键词： I-V characteristics testing,ABC-NMS algorithm,dynamic capacitor charging,PV arrays,parameter extraction,partial shading
更新于2025-09-12 10:27:22
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Effect of partial shading patterns and degrees of shading on Total Cross-Tied (TCT) photovoltaic array configuration
摘要： Effect of partial shading on PV modules is simulated. Three standard configurations of PV array consisting of series-parallel (SP), bridge-linked (BL), and total cross-tied (TCT) are studied. Nine PV panels are arranged in 3x3 array. The suitable solar radiation level to start reconfiguring the PV array according to shading pattern is investigated. Partial shading of 1, 2 and 4 panels in 9 are simulated. From the simulation results, it is found that the reconfiguration of PV arrays may not increase the power output higher than 5% when there are shaded greater than 50% of the total area. Therefore, it is unnecessary to reconfigure the PV array. Conversely, if shaded area is less than 50% reconfiguring can improve the power output. Moreover, different shading patterns provide different power outputs even if the shaded areas are equal and the points to start reconfiguring the array are different for various shading patterns.
关键词： bridge-linked,partial shading.,Solar reconfiguration,total cross-tied
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Multilevel-Boost-Converter-Neutral-Point-Clamped-Inverter Photovoltaic System with MPPT Based on Fibonacci Search
摘要： This paper deals with a system composed by a photovoltaic array feeding a Neutral-Point-Clamped inverter by a dc-dc multilevel boost converter. The system is able to adequately operate under partial shading condition. A current control allows for the boost converter to operate at high frequency while the Maximum Power Point Tracking (MPPT) with the help of Fibonacci search. System operation is explained as well as its model, control and PWM strategy. Simulation and experimental results validate the theoretical studies.
关键词： Fibonacci search,Photovoltaic systems,maximum power point tracking,NPC inverter,partial shading,boost multilevel
更新于2025-09-12 10:27:22